Turbocharger

Abstract

A turbocharger ( 10 ) comprising: a rotating shaft ( 14 ); a turbine wheel ( 12 ); a turbine housing ( 31 ); a scroll flowpath ( 34 ) having gas flowing therethrough that rotates and drives the turbine wheel ( 12 ); a nozzle flowpath ( 35 ) that guides gas radially inwards from the scroll flowpath ( 34 ) and supplies gas to the turbine wheel ( 12 ); and a vane ( 53 ) that adjusts the amount of gas introduced in the nozzle flowpath ( 35 ). The vane ( 53 ) comprises a guide section ( 60 ) that guides the gas flow (F) in the turbine wheel ( 12 ) radially inwards.

The invention claimed is: 
     
       1. A turbocharger comprising:
 a rotating shaft extending along an axis; 
 a turbine wheel disposed on a first end portion side of the rotating shaft, a plurality of blades being formed at intervals in a circumferential direction on the turbine wheel; 
 a turbine housing accommodating the turbine wheel; 
 a scroll flow path formed in the turbine housing, continuing in the circumferential direction on a radially outer side of the turbine wheel, and having gas flowing therethrough that rotates and drives the turbine wheel; 
 a nozzle flow path that guides the gas radially inwards from the scroll flow path and supplies the gas to the turbine wheel; and 
 a vane that adjusts the amount of the gas introduced in the nozzle flow path, 
 wherein the vane includes two end portions and a guide section that guides the gas such that at least part of the flow of the gas flows radially inwards on a trailing edge side of the blade of the turbine wheel, 
 the guide section is formed in a pressure surface on a side of the vane where the flow of the gas collides, 
 the guide section has a convex portion rising in a trailing edge portion on a downstream side in a flow direction of the gas, 
 the convex portion is formed such that a width-direction intermediate portion rises, in a direction away from a surface side opposite to the pressure surface, with respect to both end portions in a width direction on a trailing edge side of the pressure surface, and 
 the convex curved surface is formed such that a rise dimension of the width-direction intermediate portion gradually increases from an intermediate portion side toward the trailing edge side of the pressure surface. 
 
     
     
       2. The turbocharger according to  claim 1 , wherein the guide section has a concave portion formed in a leading edge portion of the pressure surface on an upstream side in the flow direction and concave to the surface side opposite to the pressure surface.